Centrifugal apparatus for creating pressure.



K. KIEPBR. GENTRIFUGAL APPARATUS FOR CREATING rnnssmm.

APPLICATION FILED APR.17, 1908.

Patented Aug. 29; 1911.

m m k 4/1 vvr M W m 1 4 w BEST AVAILABLE CCP.

KARL KIEFER, OF CINCINNATI, OHIO.

CENTRIFUGAL APPARATUS FOR CREATING PRESSURE.

Specification of Letters Patent.

Patented Aug. 29, 1911.

Application filed April 17, 1908. Serial No. 427,680.

To all whom it may concern:

Be it known that I, KARL Krninn, a citizen of the United States, residing at Cincinnati, Ohio, have invented a new and useful Improvement in Centrifugal Apparatus for Creating Pressure, of which the following is a specification.

My invention relates to centrifugal apparatus, in which a rotor or impeller rotates within a surrounding casing, and in which the liquid, or other medium, enters the rotor near its axis and leaves it near its periphery.

The objects of my invention are to increase the efliciency of such apparatus and at the same time simplify their construction. I attain these objects by the mechanism illustrated in the accompanying drawings in which- Figure l is a vertical section through the pump, Fig. 2 is a perspective view of the rotor.

The casing 1, Fig. 1, carries two central bearings and stufiing boxes, in which the shaft 3 rotates. Attached to this shaft is the rotor of the shape of an ordinary pulley, with its spokes, however, of the full Width of the face of the pulley. The casing l is closed with a cover 10, having a central inlet 2 for the admission of the liquid to be put under pressure. In the top of the casing 1 is an opening 7 for the exit of the liquid. The width of the rotor pulley is slightly smaller than the inner width of the casing, leaving circular spaces on both sides of the rotor, the use of which will be explained later on. The rotor pulley is here shown as having four straight spokes or blades. The rotor, however, is not restricted as regards form or number of the spokes.

I-leretofore, the rotors of centrifugal pumps were of a cross section, having the greatest area in the neighborhood of the rotor axis, and increasing in area toward the periphery, inversely as the speed of the liquid radially increased. In these pumps it was the intention of the maker to throw the liquid as quickly as possible toward the periphery of the rotor, but in order to avoid the suddenness of the impact, the impeller blades had to be curved in the manner of turbine blades, making the manufacture of an etficient pump expensive and difficult. For high pressure it was found necessary to separate the total work into several stages, resulting in the multistage centrifugal pump. Contrary to present practice, my

rotor.

rotor has a peripheral cross section of considerable area, within which a large body of liquid is accommodated. The blades or spokes 1 cause the liquid to revolve with the The narrow circular spaces between rotor and the inner walls of the casing serve for the exit of the liquid, after having received the requisite centrifugal pressure from the rotor in the peripheral part of the casing 1, from which it escapes through the openings 7.

The discharge area intervening between the inner straight walls of the casing and the rotor must be so dimensioned that the mass of the escaping liquid will not disturb the steady rotation of the revolving body of liquid within the rotor. In order to attain the highest pressure, that a pump of a given diameter is capable of developing, it is necessary to make the circular spaces so narrow that the revolving body of liquid at tains the desired peripheral pressure, before any discharge into the pressure space 6 of the casing takes place.

A great advantage of my improved pump is, that it has no need of any revolving packing rings that are used in most modern centrifugal pumps to tighten the suction side against the pressure side.

The inner sides of the casing, as well as the periphery and sides of the rotor are turned true and smooth, to avoid any unnecessary friction or churning of the liquid. The hub of the rotor pulley is cone shaped as shown in Fig. 2, numeral 12, to facilitate the ingress of the liquid.

The blades or spokes 4 that are here as of the exact width of the ley, may be varied as long as their purpose of causing the rotation uliquid with the rotor.

In the pump shown the intake of the liquid is from one side only; notwithstanding this the pump is perfectly balanced. The pump may be built, however, to take the liquidfrom both sides.

What I claim as my invention and desire to secure by Letters Patent is 2- 1. In a centrifugal pump, a cylindrical casing with closed ends and having a central inlet in one of its ends and a constricted out- .let in its periphery, and a hollow cylindrical BEST AVAlLABLE COP peller. blades dividing its interior and rotating-"withit, and having open ends in such by the casing, said casing having an inlet to the interior of the rotor and a constricted outlet from said annular space, and the rotor having interiorly located impelling means and means for rotating it, and there being constricted passages from the interior of the BEST AVAlLABLE COPY v rotor to said annular space, around both ends of the rotor, inside the casing.

3. In a centrifugal pump, a hollow cylindrical rotor with continuous and closed periphery and open at both ends, and having substantially radial impeller blades dividing its interior from one open end to the other.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

KARL KIEFER.

Vitnesses G. \V. XVERDEN, CHAS. L. RICHTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

' Washington, D. C. v 

